Oil burner



June l0, 1930. G. F. BEACH 1,763,387

OIL BURNER Filed April 6., 1926 V 2 Sheets-Sheet l June l0, 1930. G. F. BEACH 1,763,387

OIL BURNER Filed Apr-11 e, 1925 2 sheets-sheet 2 `Patented June 10, 1930 UNITED STATES PATENT oFFicE GEORGE IE. BEACH, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, 'BY MESNE AS- SIGNMEN'IS, T0 RYAN, SCULLY & COMPANY, OF PHILADELPHIA, PENNSYLVANIA.

A CORPORATION OF DELAWARE OIL BURNER Application filed April 6,

My invention relates to burners, having particular relation to those adapted to burn oil. i

One object of my invention is to provide a burner of simple, compact and rugged design that shall have a wide range in capacity and that shall be particularly characterized by its efficient operation at low oil consump- 13101118. i

Ina Patent No. 1,161,183 granted to Mircs Fuel-Oil Equipment Company, upon an appiication filed by the present applicant, is shown a valve construction, wherein a damper controls the supply of air to a spray tube as welll as to a main annular air passage.

Such type of burner has a rated oil burning range of approximately that is, the oil flow may be so reduced that the minimum oil consumption is about 50% of the maximum burner` capacity. This relatively narrow range is caused by the fact that tor oil consumptions, below the above-noted minimum, there is not suiiicient air to fill both the spray tube and the'main annular passage. Als a result of the -low air pressure in the spray tube, the oil is not carried beyond the end of the burner and into the furnace, but is permitted to drip in the space therebetween.

In accordance with the present invention, I provide means whereby a predetermined volume of air may be supplied to the sprayV `tube regardless of the fuel consumption of the burner, so that the above diiiiculties `may be overcome. i i

Other objects and applications of my invention, as well as details of construction and operation, whereby my invention may be practiced, will appear more fully hereinafter when taken in connection with the accompanying drawings, wherein Fig. 1 is a longitudinal sectional view of a burner embodying my invention;

Fig. 2 is a transverse sectional view taken' on the line II-II ot Fig. 3; and

Figs. l3 ali-d4 are side elevational and top lan views, respectively, of the structure of i0. 1. f eferringparticularly to Figs. 1 and 2, a

burner comprises a easing 1, an air inlet pas- 50 salgo 2 of which:` extends from an opening 3 1926. 'Serial No. 106,165.

and `is controlled by a damper 4. The casing 1 is also provided with an air discharge outlet 5 and a main air passage 6 which connects said inlet passage 2 and said outlet `5.

The vcasing may comprise lower, intermediate and upper parts 7, 8 and 9, respectively, part 7 comprising a casting providing a mounting for a damper supporting shaft 11, and also having a threaded boss 12 adapted to receive a bolt 13 for securing the casing part 7 to a supporting bracket arm 14 eX- tending from a furnace wall 15. The shaft 11 is provided with an operating handle 16, and it may be retained in any desired position by mean-s of a friction band 17 which cooperates with a drum 18 moun-ted on said .shaft 11.

The intermediate or rear casing part 8 h-as a lower end 19 (Fig. 2) thereof secured by bolts 21 to an upper end 22 of the lower casing part 7. A front end 23 of the casing part 8 is provided with an externally threaded portion 24 which is adapted to engage a correspondingly threadedv internal portion 25 ot a tubular nose 26 constituting the upper or front casing part 9 (Figs. 1 and 3). The latter is provided with an inner surface 27 of parabolic form that converges toward` the air discharge outlet- 5. An atomizer 28 is positioned within the casing 1 and it comprises an oil nozzle" 29, preferably of parabolic form, which is sof mountedV within the front casing. part 9 by an annular channel member 31 as to form in the part 9 an annular section 32 that communicates at its one end with the main air passage 6 and terminates at 'its opposite end in the discharge outlet' 5. The

channei 31 is preferably provided with a plurality of angle blades 33,` whereby the air may be given aA desired spiral movement.

i The nozzle 29 is provided with an oil passage 34 that extends to an annular groove 35 formed in an inner wall 36 of said nozzle. A portion 37 of the inner wall 36 between the annular groove 35 and the outer end of the nozzle 29' is of 4conical form and it co-operates with a beveled end portion 38 of a spray tube 39 that is movably .mounted within the nozzle 29, the latter having a 'threaded portion 41 i in engagement with a correspondingly threaded portion 42 of said spray tube 39. The spray tube 39, which defines a cent-ral air passage 43, extends rearwardly from the,

nozzle 29 through a tubular extension 44 of the rear casing part 8 and terminates 'in an adjusting handle 45. The oil passage 34 is similarly extended .rearwardly and it is associatedby means of a connecting nut. 46,l with an external supply pipe 47 which also extends through the tubular extension 44.

The tubular extension 44 is providedwith an inner wall 48 adapted to receive a removable plug 49, a head portion 51 of which may be clamped against an outer edge 52 of the casing part 8 to lock said plug 49 Ysecurely in position. The plug 49 ispreferably provided with a central recess 53, deiining a chamber 4 betweenitself and the casing wall 48,- thevrecess being so formed that the plug 44 `may be considered as comprising inner and outer plate sections 55 and 56 and spacing arms 57 and 58'. The `arms 57 and 58 are provided with perforations 59 and 61 through which pass a tie bolt 62 Vand the oil pipe 47, respectively. An inner end 63 of the tie bolt 62 is securedto the nozzle 29, while an outer end 64 is threaded to receivea locking nut 65. The plate sections 55 and 56 are also provided withv aligned apertures 66 and 67 through which'extends the spray tube 39. Thus, the plug 44 constitutes a support for the oil pipe 46, the spray tube 39 and the tie bolt 62. n

Communication may Vbe established between the spray tube 39 and the chamber 54 by means of a plurality'of perforations 68 positioned in the former, The chamber 54 may be somewhat enlarged between the plate sections 55-and `56 by recessing a portion 69 of the tubular extension 44, as illustrated in the drawing.

In accordance with my invention, vair is supplied tothe spray ltube 39 through a pipe 71 that extends from an aperture 72 in the wall ofthe chamber 54 to a assage 73 in a boss 74 projecting from the lower casing part 7. The passage 73. comprises vertically and horizontally extending portions 75 and 76, respectively. One end 77 of the horizontal portion-76 opens into the lower casing part 7 at a point 78 whichfis positioned below the damper'5, 'whereby ,the volume of air supplied to the spray tube V39 may be independent of the position of said damper 5. An outer end 79 of the horizontal passage section 76 is closed by means of a plug valve 81 having an aperture 82 ina tubular section 83V thereof,the aperture 82 being movable into and out of alignment with' the vertical seotion 75 of the passage 7 3while an open end 84 of said tubular section 83 is at' all times in communication with the horizontal-passage section 76., Hence, the amount otiair supplied to the rchamber 54 and spray tube 39 may be adjusted independently of the damper 5.

In operation, assuming the damper 4 in the position shown in Fig. l, the burner may be considered as operating at its maximum cathroughthe spray tube 39 strikes the oil passing from the annular groove 35 and projects the same into theV air discharging from the annular passage 32. As a result of the two air streams, the oil is thoroughly atomized and proper combustion conditions obtained.`

Vhen the burner is to be operated at low temperatures such, for example, as are required in the heat Vtreatment of non-ferrous metals, the damper 4'is actuated to reduce the volume otair supplied to the main air lpassage 6 to a value necessary for proper combustion conditions, the limiting position being that shown in dot-and-dash lines in Fig. 1, wherein the air supply is cutoff from said main passage, 6. The supply of air to the' spray tube 39, however, remains unaltered,'so that the fuel is discharged from the burner intothe furnace rather than permitted to drip inthe space therebetween, as occurred when the burner in my prior patent was operated at such low capacity. lVhen it is desired to clean the burner, it is only 'necessary to loosen the bolts 21 and reL move the upper casing parts 8 and 9, since these parts contain the sections of the burner that usually requires cleaning. Thus,; it Vis not necessary in the cleaning of the burner to shut down the source of air supply or disturb the Ypiping connected to the burner.

While I have shown only one embodiment of my invention, for the'purpose of describing the same and illustrating its principles of construction and operation, it is apparent that various changes and modifications may lbe made therein without departing ,from the spirit of my invention and Idesire, therefore, that only such limitations shall `be imposed thereon as are indicated in the appended claims or as are demanded by the prior art.

' Iclaim: j `1. A burner comprising a casing having a tubular extension, a closure plug positioned in said extensioncomprising a pair of spaced plate sections interconnected by arms, of which one is apertured to receive a fuel pipe, said plug being apertured to permit the passage therethrough of a spray tube, and a pipe extending from .the chamberl formed between the plate sections of said plug'to a predetermined point on said casing.

y2. A burner comprismg a two -partx cas- I.ingof which one part isprovided with an air `inlet opening'and a control' valve, the other part being provided with an opening having a closure plug comprising inner and outer plate sections interconnected by apertured arms, said plate sections being also apertured, and a fuel supply pipe, a spray tube and a tie rod respectively extending through said apertures. Y

3. A burner comprising a two-part casing, of which one part is provided with an air inlet opening and a control valve, the other part being provided with an opening having a closure plug comprising inner and outer plate sections interconnected by apertured arms, said plate sections being also apertured, a fuel supply pipe, a spray tube and a tie rod respectively extending through said apertures, an outer portion of said plug being adapted to abut against the casing, the plate sections of said plug forming a chamber in communication With said spray tube, and a pipe extending between said chamber and such point on said casing as to receive a constant supply of air independently of the position of the control valve.

4. A burner comprising a two-part casing, of which one part is provided With an air inlet opening and a control valve, the other part being provided with an opening having a closure plug comprising inner and outer plate sections interconnected by apertured arms, said plate sections being also apertured, a fuel supply pipe, a spray tube and a tie rod respectively extending through said apertures, the plate sections of said plug forming a chamber in communication With said spray tube, and a pipe extending be tvveen said chamber and such point on said casing as to receive a constant supply of air independently of the position of the control valve, said last-mentioned pipe having a control valve.

GEORGE F. BEACH. 

